Jonathan? Not Oscar Diggs? I'm still not sure I understand why she's suddenly pregnant with Liir since she didn't have sex or, furthermore, why this is only manifesting now when she's been back for ages.

Oh, Fiyero! He knows that Elphaba looks like she has feelings for him on occasion but refuses to have much to do with him and now he finds out that the father of her son is someone she's trying to stay away from. He also knows that the child looks like HIS mother. What kind of hint does he need?